Exodus 3:16 contains God's command to gather the elders — Moses now obeys that command.

Exodus 19:7 shows Moses again gathering elders to relay God's words — a parallel action at Sinai.

Exodus 24:1 later summons the same elders to approach God — a subsequent event involving the group gathered here.

Exodus 24:11 describes the elders seeing God and eating — a later experience of the same elders gathered here.

Numbers 11:16 has God commanding Moses to gather seventy elders — similar to this initial gathering.